Methodologically rigorous studies put the share of false rape allegations at roughly 2% to 8% of reports made to police, with a broader literature review spanning 2% to 10%. The percent of rape allegations that are false is often cited as higher than that, usually because people are reading raw “unfounded” rates from police data, which is a different and broader category than deliberate fabrication. Separately, only about one in four sexual assaults is ever reported to law enforcement, so these percentages apply to reported cases, not to all assaults that occur.
What the Studies Actually Found
The 2% to 10% range comes from a review of studies that varied in time period, methodology, and sample size. Once researchers require affirmative evidence of intentional fabrication rather than treating any unproven case as false, the estimates narrow to 2% to 8%.
David Lisak and colleagues reviewed 136 sexual assault reports filed with a northeastern university’s police department over a ten-year period. They classified 8 of those reports, or 5.9%, as false, using criteria that required evidence of fabrication rather than simply the absence of proof that an assault occurred.1Sage Journals. False Allegations of Sexual Assault: An Analysis of Ten Years of Reported Cases A multi-site study of 2,059 cases across eight U.S. communities classified 7% as false, with participating agencies trained to apply consistent definitions.
International work follows the same pattern. In an analysis of more than 2,600 sexual assault cases reported to British police, the department initially labeled 8% as false. When researchers applied strict criteria requiring either a clear admission by the complainant or strong corroborating evidence of fabrication, the figure dropped to 2%.
The FBI’s Law Enforcement Bulletin has acknowledged that research on false allegations in adult crimes remains limited, with most of the existing work focused on sexual assault.2Federal Bureau of Investigation. False Allegations of Adult Crimes What gives the 2% to 8% range credibility is convergence: different studies using different methods, with different weaknesses, keep landing in roughly the same place.
Victimization surveys offer a parallel view. The National Violence Against Women Survey, sponsored by the National Institute of Justice and the CDC, interviewed 8,000 women and 8,000 men about their experiences with sexual assault, physical violence, and stalking, capturing incidents regardless of whether they were ever reported.3Office of Justice Programs. Prevalence, Incidence, and Consequences of Violence Against Women: Findings From the National Violence Against Women Survey Each data source has blind spots. Police records miss unreported assaults. Surveys depend on self-reporting. Single-agency studies may not reflect national patterns. The agreement across imperfect methods is what carries the estimate.
Why “Unfounded” Is Not the Same as “False”
This is the single biggest reason the public figure is often inflated. In law enforcement records, “unfounded” is an administrative label applied when investigators determine the reported crime did not occur or was not attempted.4U.S. Department of Education. Campus Crime Statistics – Unfounded Crimes That umbrella covers two very different situations.
- False reports are cases where investigators find evidence that the complainant intentionally fabricated the allegation.
- Baseless reports are cases where something happened, but the facts don’t satisfy the legal elements of the offense reported. A complainant might describe behavior that was threatening or coercive but that falls short of the statutory definition of sexual assault in that jurisdiction.
FBI statistics merge both under “unfounded,” and that merger inflates the apparent rate. Historical data makes the gap visible: in 1995, 8% of all forcible rape cases nationally were classified as unfounded, and in 1996 the figure was 15%.5ProQuest. False Rape Allegations: An Assault On Justice Those percentages sit well above the 2% to 8% rate that studies find when they actually separate fabricated reports from baseless ones. The difference represents real incidents that didn’t fit a legal definition, not deliberate lies.
Someone citing a 15% unfounded rate as if it meant 15% of accusers lied is making an error the underlying data does not support.
What the Rate Is a Percentage Of
Every false report figure is calculated as a share of reports filed with police, and most sexual assaults never reach that stage. Bureau of Justice Statistics data has consistently shown that roughly one in three rapes captured by the National Crime Victimization Survey are reported to law enforcement.6Bureau of Justice Statistics. Assessment of the Rape and Sexual Assault Program The most recent NCVS data found that just 23.6% of rape and sexual assault victimizations were reported to police.7Bureau of Justice Statistics. Criminal Victimization, 2024
If roughly one in four assaults is reported, and 2% to 8% of those reports are false, then false reports account for well under 2% of all sexual assaults that actually occur. Unreported assaults dwarf fabricated reports by a wide margin.
Who Decides a Report Is False
Only sworn law enforcement personnel have the authority to classify a case as unfounded, and the investigation must be thorough before that classification is applied.4U.S. Department of Education. Campus Crime Statistics – Unfounded Crimes A patrol officer taking the initial report cannot declare a case unfounded on the spot. That safeguard exists because snap judgments at intake, based on a complainant’s demeanor, delayed reporting, or inconsistencies common in trauma recall, have historically led to premature dismissals. The International Association of Chiefs of Police has issued guidance urging agencies to adopt a victim-centered approach to sexual assault investigations rather than rushing to classify outcomes.8International Association of Chiefs of Police. Investigating Sexual Assaults
Criminal Penalties for Filing a False Report
A fabricated police report carries real criminal consequences. Most states treat false reports as misdemeanors, with penalties that can escalate to felony charges when the fabrication causes serious harm, such as a wrongful arrest or imprisonment. Specific penalties vary by state, and some impose steeper sentences for repeated offenses or for false reports involving serious felonies.
At the federal level, knowingly making a false statement to a federal investigator is a crime under 18 U.S.C. § 1001, punishable by up to five years in prison. If the false statement involves a sexual abuse offense, the maximum rises to eight years.9Office of the Law Revision Counsel. 18 USC 1001 – Statements or Entries Generally That enhanced penalty is one of the less widely known provisions of the statute.
Perjury, which is lying under oath during a legal proceeding, is a separate offense under 18 U.S.C. § 1621 and also carries up to five years in federal prison.10Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally Filing a false police report and lying on the witness stand are different crimes with different elements, and the same person could face charges for both. A conviction for either offense creates a permanent criminal record that can affect employment, housing, and credibility in any future legal proceeding.